Jig-saw.



No. 882,044. PATENTED MAB.. 17, 1908.

. A. ANDERSON.

JIG SAW.

APPLICATION FILED MAY 11. 1907.

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n ztor: lrftnessesfv.. I Ue No. 882,044. A PATENTBD MAR'. 17.1908.

A. ANDERSON.

JIG SAW.

.APPLIoAT-Ion rum) MAY 11. 1901.

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ALFRED ANDERSON, OF SOMERVILLE, MASSACHUSETTS.

#TIG-SAW.

Specication of Letters Patent.

Patented March 17', 1908.

Application filed May 11, 1907. Serial No. 373,149.

To allwhom it 'may concern.'

Be it known that I, ALFRED ANDERSON, a citizen of the United States, residing at Somerville,` in the county. of Middlesex and State of Massachusetts, have invented new and useful Improvements in Jig-Saws, of which the following is a specification.

This invention relates to improvements in jig saws, and the object is to e'll'ect general improvements including means whereby the saw frame may be adjusted to cause the saw blade to run perfectly true, a simple effectual pump to blow away the saw dust, means for maintaining a positive tension on the saw blade, and other objects and advantages which will appear hereinafter.

Referring to the drawings: Figure 1 is a side elevation of my improved jig saw, the table being partly broken away to save space in the drawings. Fig. 2 is an enlarged detail plan section taken on line 2 2 of Fig. 1. Fig. 3 is an enlarged detail plan section taken on line 3 3 of Fig. 1. Fig. 4 is a plan ofthe machine, the table being partly broken away to save space in the drawings. Fig. 5 is an enlarged detail sectional elevation taken on line 5 5 of Fig. 1, looking toward the right. Fig. 6 is a sectional elevation taken on line 6 6 of Fig. 1, looking toward the right.

Like numerals refer to like parts throughout the several views of the drawings.

In the drawings, 10 is aframe provided with feet or brackets 11, 11 formed thereon upon which said frame may be supported on a bench or any other suitable support. crank 12 comprises a crank shaft 13 journaled in the frame 10, a crank disk 14 fast to said shaft, and a crank pin 15 having screwthreaded engagement with said crank disk. The crank disk 14 is preferably provided with a plurality of screw-threaded holes 16 located at different distances from the axis of the shaft 13, said holes being adapted to receive thescrew-threaded stem of the crank pin 15. By' placing the crank pin 15 in the different holes 16 different lengths of stroke may be obtained.

The frame 10 is provided with ways or guides 17, 18 and 19 in which are mounted slides 20, 21 and 22, respectively. A U- shaped saw frame 23 having arms 24 and 25 is secured to the slides 20, 21 and 22. A link orconnecting rod 26 is pivotally connected at its lower end to the crank pin 15 and is pivotally connected at its upper end to a studVY 27, said stud having screw-threaded vertical position.

engagement with the arm 25 of the frame 23. A table 28 is pivoted at 29, 29 to the frame 10, lsaid tableI being provided with a hole 30 :through which extends alsaw blade 31, said Isaw blade kbeing securedpat its upper end in arod 32 and at its lower end in a rod 33, there being two thumb nuts 34 and 35 by means of which said saw blade is clamped to said rods. A cam lever 36 is pivoted at 37 to a nut 38, said nut having screw-threaded engagement with the rod 32. The rod 32 may be adjusted vertically by rotating the nut 38 thereon in the proper direction. T he tension on the saw blade 31 may be entirely released by throwing the cam lever 36 into a The rod 32 is provided with a groove 39 which a screw 40 engages to prevent said rod from rotating. The rod 33 may be adjusted vertically by means of two nuts 41 and 42 having screw-threaded engagement therewith.

A truss 43 comprises a wire 44 which extends from a hook 45 over a strut 46, a second strut 47, through the arm 24 back over the strut 47, the strut 46 and is connected at its other end also to the hook 45. The hook 45 extends through a lug 46A formed on the frame 23, there being a nut 47 having screwthrcaded engagement with said hook whereby the tension of the wire 44 may be adjusted. The arm 24 is adapted to reciprocate between two guides 48 and 49, the guide 48 being provided with a slot 50 through which extends a screw 51 having screwthreaded engagement with the frame 10. Two hollow bushings 52,-52 having screwthreaded engagement with the guide 49 surround two screws 53, 53, respectively, said screws having screw-threaded engagement with the guide 48. By slightly loosening the screws 53, 53 the bushings 52, 52 may be rotated to adjust the guide 49 with relation to the guide '48 and when said guide 49 is properly adjusted the screws 53, 53 are then tightened to lock the bushings 52, 52 against rotation.

A pump cylinder 54 is fast to the guide 48, there being a piston 55 adapted to reciprocate within said cylinder, said piston being connected by a U-shaped rod 56 to the arm A pipe 57 leads from the under side of the cylinder 54, the free end of said pipe eX- tending toward the saw blade 31. A pulley 58 fast to the shaft 13 may be connected by a belt to any suitable source of power.

The general operation of the machine hereinbefore described is as follows: crank l2 is rotated the frame 23,l is reciprocated, the slides 20 21 and 22 moving in their respective ways 17, 18 and 19 and the arm 24 moving between the guides 48 and 49. Thej saw blade 3l reciprocates-in a usual and Well known manner through the hole 30 in the work table 28. Asthe piston 55 is reciprocated in the cylinder 54 a stream of air is iblown inthe" direction of: the sawblade 31 andthe table-28, therebyblowingv the sawdust out offtheV way. In order that" the'saw blade'l 31 may run perfectly true it is, of course, necessary that.' itsv side-faces shall'lie in planes parallel' to the direction of movement ofI theframe 23. 48 is adaptedk tobe adjusted horizontally with relation to the frame 10 by loosening the clampingscrew 51,r and when saidy guide isr properly positioned clamping said guide in the adjusted position. In case of any wear on theA guidingv faces ofthe guides 48 and 49, the guide 49 may be adjusted toward therguide 48 to-talre up such wear as hereinbefore described.

Having thus described my invention, what I-'claim and desire by Letters Patent to secure 1s:

1.y In a jigsaw, a stationary frame, a U- shaped frame arranged to move vertically thereon, said U-shaped frame provided with two arms, a saw connected to said arms, a guide Aadapted to maintain one ofsaid arms infiixed position horizontally, andan adjustable guide adapted to'move the other'of-said armsfhorizontally with relation to said first arm.

2*.v In ai jig saw, a stationary frame, a U- shaped frame mounted to slide vertically thereon, said U-shaped frame provided with twoarms, a guide in which one ofsaidrarms is arranged to slide: vertically, said guide adapted to maintain said arm in fixed position horizontally, and a second guider in which the other of said arms is arranged to slide vertically, said second guide adapted to be adjusted'horizontally with relation to said iir'st-namedguide.

As the Y shaped frame arranged to move vertically To this end the guide 3.` Ina jig saw, a stationary frame, a U- thereon, said U-shaped frame provided with two arms, a saw connected to said arms, a plurality of guides arranged at intervals valong oneY ofl said arms and adapted-tomaintain the same in fixed osition horizontally, andan adjustable guide adapted to move the other of said arms horizontally with relation to said first arm.

4'. Ina jig saw, a stationary' frame, aA U- shaped frame provided with two substantially horizontalI arms, a plurality` of? slides fast to voneof saidarms at-int'ervalsarranged to -slideonlsaid stationary'frame andadapted to maintain saidarm in'lxed positionhorizontally, andan-adjustable guidead'apted to move the other yof said armshorizontally with relation-to saidfirst arm.

5. In a jigsaw, a stationary frame, a U- shaped frame arranged tolmove vertically thereon, said U-shaped frame providedwith two arms, a saw connected to said arms, two guidesV betweenV which one of' said armsv is arranged to slide vertically, a plurality of sleeves having screw-threaded engagement with one ofV said guidesand bearing against thevotherof saidA guides, and a plurality of screws passing throughsaid sleeves, respectively, and arrangedI to lock said sleeve against rotation.

6. In a jig saw, a stationary frame, a' U- shaped frame arrangedl to move'ver-tically thereon, said U-shapedframe-provided with two arms, a saw connected tosaidarms, and two guides between whichone of said arms is arranged to slide vertically, said' guides adapted to be adjustedv in unison horizontally, one of saidguides being adjustable toward and'away from theotlier of said guides.

In testimony whereof I'have hereunto set my handin presence of twofsubscribing witnesses.

ALFRED ANDER-SON.

Witnesses:

LoUIs A. JONES, SADIE V. MCCARTHY. 

